Question

The sum of the angle measures of any triangle is 180. the second angle measures three times first, and the 3rd angle measures 20 less than the first. what is the measure of each of the angle?

Answer 1

We have a set of 3 equations, given angle 1, a1, angle 2, a2, angle 3, a3
a1 = a1
a2 = 3a1
a3 = a1/20
a1 + a2 + a3 = 180
Set the last equation to only have one variable using substitution
a1 + 3a1 + a1/20 = 180
79a1/ 20 = 180
79 a1 = 3600
a1 = 45.6 degress

Now we know a1 and can solve for all the other angles easile
a2 = 3a1
a2 = 3(45.6)
a2 = 136.8

a3 = a1/20
a3 = 45.6/2-
a3 = 4.56/2
a3 = 2.28

Answer 2

how did u get 79?

Answer 3

nvm thanks